Using Slope-Unit for Landslide Fragility Curves on the Regional Landslides Assessment

• Main Authors: Ang-tai Hsieh, 謝昂泰
• Other Authors: Bing-chian Lee
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/05388677390272516906

碩士 === 逢甲大學 === 土木工程學系 === 102 === On August 8th 2009, the middle Typhoon Morakot struck Taiwan, and it not only brought around 2000 mm rainfall in south-central Taiwan but also caused a wide range of landslides in eastern and southern sloping fields of Taiwan. Due to the fragile geology and precipitous landforms, plus the development of rare landslide type and barrier lake which intensified the condition of disaster in south-central Taiwan. This study adopts maximum rainfall intensity Imax as rainfall indicator, preceding rainfall R0 and cumulative rainfall R as collapsed thrust, and the collapsed area which is captured from the satellite image to calculate the probability for landslide caused by rainfall which is based on Geographical indexes (Slope Level, NDVI, and River Distance), adopting maximum likelihood method (MLE) to obtain two parameters of median μ and Log-standar deviation σ to draw the probability distribution under various physiographic conditions, namely Landslides Fragility Curves (LFC). Substituting the probability of different rainfall factors into slope unit, and take percentage of each category to weight, and Slope-Unit for Landslide Fragility Curves will be derived. The establishment of Fragility Curve for slope units, the development of reasonable description, the management capacity for landslide alert and disaster assessment method, expecting to be an important basis which can be directly applied to decrease disaster and as an emergency measure before hazard in daily life